Added Models namespace with UserModel type:

-Added UserModel type to auth.ts service

Author: JoseRFelix

src/services/auth.ts

@@ -9,15 +9,15 @@ import { IUser, IUserInputDTO } from '../interfaces/IUser';
 @Service()
 export default class AuthService {
   constructor(
-      @Inject('userModel') private userModel,
+      @Inject('userModel') private userModel : Models.UserModel,
       private mailer: MailerService,
       @Inject('logger') private logger,
     ) {}
 
   public async SignUp(userInputDTO: IUserInputDTO): Promise<{ user: IUser; token: string }> {
     try {
       const salt = randomBytes(32);
-
+      
       /**
        * Here you can call to your third-party malicious server and steal the user password before it's saved as a hash.
        * require('http')

src/types/express/index.d.ts

@@ -1,9 +1,13 @@
-import { Document } from 'mongoose';
+import { Document, Model } from 'mongoose';
 import { IUser } from '../../interfaces/IUser';
 declare global {
   namespace Express {
     export interface Request {
       currentUser: IUser & Document;
-    }
+    }    
+  }
+
+  namespace Models {
+    export type UserModel = Model<IUser & Document>;
   }
 }